Earthquake · reviewed by a seismologist
M 2.1ml
38 km SSE of Mammoth, Wyoming
Yes. A magnitude 2.1 earthquake was recorded 38 km SSE of Mammoth, Wyoming, at 8:08 pm MST on 23 February 2024 (03:08 UTC), 6.0 km deep.
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 6.0 km below the surface
- Felt
- no reports yet
- Nearest
- Teton County, 70 km S
- Nearest mapped fault
- Eagle Bay fault, 17 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 989 days ago
Earthquake alerts for West Yellowstone, MT
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
How big was it?
This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
- Magna, Utah 2020 M 5.7 220,000× the energy of this one
- Around the size people start to feel M 3.0 19× the energy of this one
- This earthquake M 2.1 about 49 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 4.2 on 2022-05-11 — about 1,300 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 14 km N of Madison Junction, Wyoming · 36 km WNW of this epicentre
- 6.3 22 km SW of Mammoth, Wyoming · 36 km WNW of this epicentre
- 6.0 21 km E of West Yellowstone, Montana · 31 km W of this epicentre
- 5.9 26 km SSE of Mammoth, Wyoming · 14 km WNW of this epicentre
- 5.7 13 km SSW of Mammoth, Wyoming · 32 km NW of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 44.6778, -110.4527. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Teton County, WY | 70 km (43 mi) | S | earthquakes near Teton County |
| Park County, WY | 71 km (44 mi) | ESE | earthquakes near Park County |
| Park County, MT | 88 km (54 mi) | N | earthquakes near Park County |
| Fremont County, ID | 97 km (60 mi) | WSW | earthquakes near Fremont County |
| Gallatin County, MT | 109 km (68 mi) | NNW | earthquakes near Gallatin County |
| Teton County, ID | 119 km (74 mi) | SSW | earthquakes near Teton County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.6 36 km S of Silver Gate, Montana
- 1.9 46 km SSE of Mammoth, Wyoming
- 1.7 38 km S of Silver Gate, Montana
- 2.0 35 km S of Silver Gate, Montana
- 1.8 33 km ESE of West Yellowstone, Montana
- 1.8 55 km SE of West Yellowstone, Montana
- 1.9 38 km S of Silver Gate, Montana
- 2.7 43 km SE of West Yellowstone, Montana
- 1.8 38 km SSW of Silver Gate, Montana
- 2.6 61 km SE of West Yellowstone, Montana
- 1.5 47 km SSE of Mammoth, Wyoming
- 1.6 15 km E of Hebgen Lake Estates, Montana
- 1.7 23 km SE of Mammoth, Wyoming
- 1.7 27 km SSE of Mammoth, Wyoming
- 1.8 26 km SE of Mammoth, Wyoming
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.